The answer is D: Luckily, Goldie was going to be okay. Ronnie wishes positively that his dog will have a good care somehow, but the use of the <em>adverb</em> <em>luckily </em>is not coherent with the verb was going to be, because this <em>verb in the past tense</em> means that there is an intention, but the action didn't really happen.
